Fuel

[seventieshow]

This is a bit dated but most of these places are still around.

http://azmustangs.com/racegas.htm

Some airports won't sell gas to walk ins, some will. The smaller the airport the better. 100LL avgas works well in old cars but will eventually be phased out.

[Lynn]

Originally Posted by seventieshow

This is a bit dated but most of these places are still around.

http://azmustangs.com/racegas.htm

Some airports won't sell gas to walk ins, some will. The smaller the airport the better. 100LL avgas works well in old cars but will eventually be phased out.

Say it ain't so!!!!

[x33rs]

I run the same 91 octane here in Arizona in all the cars.

The 69 Z with 11:1 compression my wife daily drives for the last 6 years and it's had nothing but 91 octane. My 70 Formula with 10.13:1 compression is the same and I drive that one nearly everyday myself.

We have a few other cars with high compression that also use nothing but 91 octane, one of them makes 724 hp on it, on motor alone.

When I built these engines I took steps to make sure the higher compression would live on the cat pee we have at the pumps by doing things like making sure the pistons are at zero deck for tight quench, degreeing the camshaft so intake valve opening is about .030-.035" more than exhaust at TDC overlap stroke, hardened seats, stainless valves, and a bunch of time, usually on a dyno, with tuning the carbs and dialing in a good ignition curve with proper vacuum advance etc....because I don't like to give up power either. Going through this isn't a cheap endeavor and may not be an option for those with survivor cars, but it's what I do to make these cars live with what's easily available while still maintaining what makes these engines so great.

I started building engines like this more than 20 years ago simply because mixing fuel had already started to become a problem and way too expensive even back then. I can't even imagine going through that now. Plus we drive our classics daily, everywhere. They have to run what ever I can find at the pumps.

[firstgenaddict]

Originally Posted by seventieshow

This is a bit dated but most of these places are still around.

http://azmustangs.com/racegas.htm

Some airports won't sell gas to walk ins, some will. The smaller the airport the better. 100LL avgas works well in old cars but will eventually be phased out.

YES it will be phased out HOWEVER the replacement will be AVIATION GRADE 100 octane no lead and ZERO ethanol. Which is great for muscle cars.
The ethanol blend in street high octane fuel is what is causing so many issues with muscle cars, it changes the RVP which leads to boiling fuel in the fuel bowls and ethanol also leans the airfuel mixture as ethanol has 1/3 fewer BTU's as the same volume of gasoline, computer controlled engine can increase the fuel whereas a carb has the jets it has...
For example from 71 -72 the LT1 carb jetting leaned from 70-71 with a 72 primary to 1972 with a 68 primary.
If you are already leaner due to emissions in your carb then running a "lean" fuel the carb will be even leaner and your engine will probably run a little hotter.